HTML with JavaScript via C++

Converting Excel Workbook to HTML

The Aspose.Cells API provides support for exporting spreadsheets to HTML format. For this purpose, Aspose.Cells uses the HtmlSaveOptions class to provide the flexibility to control several aspects of the output HTML.

The code example below shows how to save a workbook as an HTML file using JavaScript via C++:

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example</title>
    </head>
    <body>
        <h1>Aspose.Cells - Convert Excel to HTML</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Convert to HTML</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat } = AsposeCells;
        
        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            const fileInput = document.getElementById('fileInput');
            if (!fileInput.files.length) {
                document.getElementById('result').innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
                return;
            }

            const file = fileInput.files[0];
            const arrayBuffer = await file.arrayBuffer();

            // Instantiating a Workbook object from the uploaded file
            const workbook = new Workbook(new Uint8Array(arrayBuffer));

            // Saving the workbook to HTML format
            const outputData = workbook.save(SaveFormat.Html);
            const blob = new Blob([outputData], { type: 'text/html' });
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'out.html';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download HTML File';

            document.getElementById('result').innerHTML = '<p style="color: green;">Conversion completed! Click the download link to get the HTML file.</p>';
        });
    </script>
</html>

Converting Excel Workbook to MHTML Files

MHTML combines normal HTML with external resources (that is, content that is usually linked into, like images, animations, audio, and so on) into one file. They are used for emails with the .mht file extension. Aspose.Cells supports reading and writing MHTML files.

The code example below shows how to save a workbook as an MHTML file using JavaScript via C++:

<!DOCTYPE html>
<html>
    <head>
        <title>Aspose.Cells Example - Save as MHT</title>
    </head>
    <body>
        <h1>Save Excel as MHT Example</h1>
        <input type="file" id="fileInput" accept=".xls,.xlsx,.csv" />
        <button id="runExample">Run Example</button>
        <a id="downloadLink" style="display: none;">Download Result</a>
        <div id="result"></div>
    </body>

    <script src="aspose.cells.js.min.js"></script>
    <script type="text/javascript">
        const { Workbook, SaveFormat } = AsposeCells;
        
        AsposeCells.onReady({
            license: "/lic/aspose.cells.enc",
            fontPath: "/fonts/",
            fontList: [
                "arial.ttf",
                "NotoSansSC-Regular.ttf"
            ]
        }).then(() => {
            console.log("Aspose.Cells initialized");
        });

        document.getElementById('runExample').addEventListener('click', async () => {
            const fileInput = document.getElementById('fileInput');
            const resultDiv = document.getElementById('result');
            if (!fileInput.files.length) {
                resultDiv.innerHTML = '<p style="color: red;">Please select an Excel file.</p>';
                return;
            }

            const file = fileInput.files[0];
            const arrayBuffer = await file.arrayBuffer();

            // Load your source workbook from the uploaded file
            const workbook = new Workbook(new Uint8Array(arrayBuffer));

            // Save file to MHT format
            const outputData = workbook.save(SaveFormat.MHtml);
            const blob = new Blob([outputData], { type: 'application/octet-stream' });
            const downloadLink = document.getElementById('downloadLink');
            downloadLink.href = URL.createObjectURL(blob);
            downloadLink.download = 'out.mht';
            downloadLink.style.display = 'block';
            downloadLink.textContent = 'Download MHT File';

            resultDiv.innerHTML = '<p style="color: green;">File converted to MHT successfully! Click the download link to get the result.</p>';
        });
    </script>
</html>

Advanced topics

Pdf with JavaScript via C++ Convert Revision of XLSB to XLSM with JavaScript via C++